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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3eef19c660793a5fb23fb83f88b90dc2254464cb3cae1f3a163b109ad4252374' 
  AND token = '6vqE5qhv5PMOIPA/c2P4q5n+h94LylT05WEtJtBZ2SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}